Two-tone die casting and method of forming the same



March 1941- D. MARINSKY ETAL 8 TWO-TONE DIE CASTING AND METHOD OF FORMING THE SAME Filed May 25, 1957 1: 5;. 1 fig fillilFl W I 49 INVENTORS a 04105 MARY/MEX) ATTORNEY v class and for the purpose UNITED STATES PATENT oFFicE- TWO-TONE DIE Davis Marinsky assignors to New York, N. Y., a

cas'rmc AND vMirrnon 0F mums THE sum:

and Louis H. Morin, Whitehall Patents corporationo! New York Bronx, N. Y., Corporation,

7 Application May 25, 1937, Serial No. 144,627

8 Claims. (01. 18-59) This invention relates to. the die casting of various kinds and classes of devices and particularly in forming such devices in two distinct casting operations to form what may be termed, two-tone or two-color castings so as to produce on the resulting patterns, or contours device, predetermined designs,

in two distinct shades,

tones, or colors, and the object of the invention is to provide a device wherein the separate or tions of a complete of the class described individually cast pordevice have interengaging means to securely anchor and retain said portions against relative separation; a still further object being to provide a method of forming two-toned or two-colored devices which consists in providing a die, the are provided with impressions, each separate parts of which two distinct mold chambers or in direct communication with a. single admission orifice, and in intermittently moving two distinct discharge nozzles into registering alinernent with the die in a successive se the adinission orifice of ries of casting operations to form die cast members, each consisting of both of the casting materials employed to produce the two-tone or resulting devices; vide a die for carrying contemplated, adjacent parts of the die having independent mold eavities or impressions, one

two-color efiects in the a further object being to proout the method herein surfaces of the separate of which is of a contour defining a portion of the resulting device to be formed, and the other oi which 7 the casting made in the first and including additional impression adapted to receive impression,

has a part or cavity areas forming the second part of the complete device, and still further in the provision of a method wherein each cavity or impression of the die parts is charged simultaneously with the material discharged from a nozzle 50 that alternate cast devices will have a different arrangement of these and other objects in thereon, and with the casting .materials view, the invention consists in a device of the specified, which is simple in construction, eflicient in use, and which is constructed claimed.

The invention is ing specification, of drawing forms a part,

hereinafter described fully dis'closed in the followwhich the accompanying in which the separate parts of my improvement are designated by suitable reference characters in" each of the views,

and'in which:

Fig. 1 is a diagrammatic view illustrating the arrangement of parts 0 f discharge nozzles of a tended purposes,

and

die casting machine, adjacent one surface-of the dies employed for forming castings-ot the kind under consideration.

Fig; 2 is a face view of one of the die parts employed, -diagrammatically illustrating the method of'injecting casting material into the impressions of thedie parts and showingthe formation 0! a number of castings.

Fig. 3 is a section on the line 3-4 showing the dieparts separated;

Fig. 4 is a view similar to Fig.' 3 butvshowing the dieparts in closed. position withthe castings arranged therein, and y Fig. 5 is a face view of a part of a separable- 01 Fig. 2 1

fastener indicating the use of the'device formed by the method disclosed in Figs; 1m 4 inclusive.

' The-invention herein described is designed. for die'casting various kinds and classes of devices by the use of two casting'materials havingdifferent characteristics resulting device, what may be termed a two-tone or two-color effect in any desired ornamental arrangement to add to the attractiveness or to enhance the appearance oi. the device. While any kind or class ofdie be employed'which may besuit'ableiorthe init is preferredvthat the devices be cast from thermoplastic material in accordance with methods disclosed in our prior applications, 131,606, 131,607, and 131,608, filed March 18, 1937.

In the accompanying drawing, parts of two nozzles l0 and H are indicated in Fig.1 oi the drawing, and these nozzles may constitute-parts; of discharge mechanisms such as diagrammatically. illustratedv in the applications above referred to, and through. which suitable casting material. lfla and .I la aredischarged under-pressure through an admission opening or orifice l2 on theparting line of two die parts I3, 1311 and through diverging channels 12a, lZb which open. into and communicate with independent impressions or mold cavities I4 and, 15, formed between terial of the same group and class is disposed in the nozzle II. It will of course be, understood thatany combinations of colors maybe used,,- or diiferent shades in two tonesoi blue or will also be understood that one or a single color, for example twov tones of, red, etc. It

both, or the u so as to produce on the 29 casting materials may 25,;

a nozzles may contain a combination of colors to produce what may be termed a mottled or marble which would not adhere, a suitable means 'of j g V 1 or combinations of colors may, be'usediin, or

' 'tr'ate the method'. At this time it will be unders colors in accordance with the teachings in rying the invention'into effect. In Flg. -5 of-the drawing, 2| represents eifect. For example, one nozzle may have a material which will produce a pearl finish, and the other a plain color or a combination oi t e prior applications herein referred to. i f The mold cavity or impression I is designed 'to'form, one part or section ii of the resultingdevice, whereas the cavity or impression I5,

is, of such contour as to receive .the'cast device l6 and to form an additional part or fsectionlli in'conjunctionwith the section or part l6. The: cavity or impression. I4 in the construction: shown, has an inwardly projecting lug' Ila? which forms in the resulting casting an aperture lia, through which lugs or projections I5a inthe impression ii are adapted to pass in arj ranging part it in theimpression l5, and other lugs -orp'r ojections 15a, @I 5b, are formedin the inipresslon I5 to provide in the resulting cast 1 part ll,'*an aperture Ila. Onewall of the im- .pression 14, the lupper wall in the construction 1 shown, is -"pr. ovided;- with inwardly projecting y-shapedportions Mb, which iorm a'Y-shaped tongue I 86 atthe upper edge of the casting I 6, which ltongueforms means for positively keying; the part I! to the-part ll, asLwiIl be apparent. This keyingof the parts is not absolutelyessen- 1 tial;. and other meansmay be provided to accom- .plish this result when the result is desired.

Under ordinary circumstances, suflicient' adher- 'ence will be provided between the two cast parts to secure them together, but should these parts Q; p v

j of colors employed in any particularrun oi the machine. From time to "time, difierent kinds be composed of die cast metals or, other materials keying or interlocking the parts will be desirable. f In the accompanying drawing, the resulting -device-l8 made from the two parts' lfi and ell,

is in the form' of a pull or finger piece'such as commonly employed on-the' slider Hot what is known as-separable fasteners, thefpull l8 being attached to aloop caring-20 onJthe-slider which passes through the aperture "a. In the accompanying' drawing the dimensions ,of the 'pull haverbeen exaggerated, especially in Figs. 3

and 4 of the drawing, in order to clearly illusstood that the illustration in the accompanying drawing'is simply to show one method or carparts of thectapes or-stringers 10! a separablei'astenerfhaving the coupling links or clips 22 I .'which enters the upper n en'd portion of the impression or cavity ll 'so-that the castingitis formed thereon. This core pin will serve to move 6 the casting .IG downwardly between the'dle pants itvhen separated, as shown'in Fig. '3. to positionj the part IS in proper alinement with respect to *the impression or cavity I 5.: When thedies are in 'a partially closed position, the pin 2 l, is raised to the-I position shown Vin-Figs- 2' and' 4, for the V fnext'casting operation. r r .7 The method 01' operation will be readily under'a stood from the foregoingv description ,taken in connection with theaccompanying drawing and the following statement, Assuming that the d es are in closed position and the nozzle l register thereon; which are-coupled and uncoupled by ing with the aperture l2 asin Figs. 1 and 2 of the drawing, the castingmaterial l0a is forced into both of the" impressions l4, l5 through the diverging channels i 2a, I21), and a red cast part l6 and part. I! will be termed. At this time it will, be apparent that in the first shot or charge, when a part IS'has not been'preformed, the entire cavity l5 will-be filled with the one material or. color of material, and the member so formed will be an unused blank which may be melted or, if desired, which may be used in its single colorv form. After the first casting operation, the. dieparts 'are separated and the castings move into the position shown in Fig. 3,

the pin I removed from the castings and returned to its normal position after which the dies are closed and the part I 6 willbe arranged within the cavity I 5 or the lower portion thereof.

During the last "cycle of oper tion, the nozzle nwill' be moved into registering position with'flthe aperture 12, andthematerial Ila willthen be injected into the mold cavities. material tobe blue, a blue casting 16 will be .ij'ormd inthe impression it, and a blue upper end or party i1 will be formed upon" the top 'of the' previously formed' red part i6, thecresult of which is indicated in the casting shown at |8a in Fig. 2 of the drawing,'whereas the casting 18b represented in the lower'part of the dies in Fig. 2

be in the two different'colors or combinations discharged from the nozzles 10,; H, to satisfy or the drawingythat the dischargeends of the being. formed, and. the :diflerent arrangement "and contour of cavities provided in'and between adjacent surfacesofvthe' die parts. It will also be apparent that any kind or class oi engrav-- ings may provided on the separateparts' of the resulting casting. In some instances'the. material oione cast part may'extend' into the.

Assuming this of the drawing has ared top part" and a" blue lower part I 6. Inother words, alternate cast- 'ings in thesuccessive series'of operations will thedemands therefor. It will'be understood that 1 the gate portions 25 which join-the castings,

one with the other as they leave the dies, may. i be broken or: sheared off in what may betermed a trimming or finishing operation; These" gate 1 portions maybe remel-ted as will be apparent.

I It 'will be seen upon a consideration 01' Fig. l

other. cast part to provide attractive designs or'( surface thereof. 7 V. r c

Having i'ully describedzour invention, what we 1 ornamental eil'ects, the accomplishment of which simply depends uponthe formation 01' the mold V cavities orimpressions in the die parts. Inthis' respect it will be appar nt that one sidesurface c of the resulting device may differ inits orna- =mental characteristics from the opposed side H 1. The herein described method of forming two-tone die cast thermoplastic members of the class described, which consists in first forming one part of a unitary casting by pressure injecting thermoplastic material from one cylinder, into one cavity of a die to form a cast part therein, then moving said part into another larger cavity in said die, then pressure injecting a contrasting thermoplastic materi 1 from another cylinder simultaneously into both of said cavities to form a resulting two-tone unitary casting in the larger cavity, and to form in the first cavity the first part of the next successive casting to be formed. v

2. The herein described method of forming a unitary die cast body, which consists in pressure injecting thermoplastic material into one mold cavity to form a first part of said unitary body, then moving the first cast part into another mold cavity formed to receive the first part and to define the contour of a second part to be formed, then pressure injecting thermoplastic material into the second cavity to form the second thermoplastic part of said unitary body directly upon the first formed part disposed in the second mentioned cavity, and simultaneously injecting material into the first mentioned cavity to form the first part of the next successive casting to be formed.

3. The herein described method of forming a unitary die cast body, which consists in pressure injecting thermoplastic material into one mold cavity to form a first part of said unitary body, then moving the first cast part into another mold cavity formed to receive the first part and to define the contour of a second part to be formed, then pressure injecting thermoplastic material 4 into the second cavity to form the second thermoplastic part of said unitary body directly upon the first formed part disposed in the second mentioned. cavity, simultaneously injecting material into the first mentioned cavity to form the first 45 part or the next successive casting to be formed,

forming the first casting upon a core pin, utilizing said core pin to feed the first casting into the second mentioned cavity, intermittently moving independent discharge cylinders into regis- 50 tering position with the cavities of said dies in forming successive castings, and employing dif-' ferent colored thermoplastic materials in said cylinders to provide cast parts of different colors in each unitary body.

55 4. The herein described method of forming a unitary die cast body, which consists in pressure injecting thermoplastic material into one mold cavity to form a first part of said unitary body, then moving the first cast part into another mold 50 cavity formed to receive the first part and to define the contour of a second part to be formed, then pressure injecting thermoplastic material into the second cavity to form the second thermoplastic part of saidunitary body directly upon 05 the firstformed part disposed in the second mentioned cavity, simultaneously injecting material into the first mentioned cavity toform the firstv part of the next successive casting to be formed, forming the first casting upon a core pin, and utilizing said core pin to feed the first casting into the second mentioned cavity.

5. The herein described method of forming a successive series of two-tone thermoplastic die cast members, which consists in first pressure injecting thermoplastic material simultaneously, into spaced mold cavities of a die, said cavities differing in size to form one part of the resulting member in the smallest cavity and another part of the member united with a first part in a larger cavity, moving the member from the smallest cavity into the larger cavity and simultaneously discharging the united castings from said larger cavity, and intermittently moving independent cylinders into registering position with the die to alternate the color of thermoplastic material injected into the cavities.

6. The herein described method of forming a unitary die cast body, which consists in pressure injecting thermoplastic material into one mold cavity to form a first part of said unitary body including projecting interlocking elements on one surface thereof, then moving the first part into another mold cavity formed to receive the first part and to define, the contourof a second part to be formed while at the same time exposing the interlocking elements in the last mentioned cavity, thenpressure injecting thermoplastic material into the second cavity to form the second thermoplastic part of said unitary body directly upon the first formed part disposed in the second mentioned cavity and around the interlocking elements thereof, and simultaneously injecting material into the first mentioned cavity to form the first part of the next successive casting to be formed.

'7. A unitary die cast body of predetermined contour, said body comprising two parts, adjacent surfaces of said parts being united by interlocking elements, said elements being so shaped as to prevent relative movement of the parts longitudinally and transversely, thereby permanently uniting said parts against separation in any direction, and adjacent surfaces of the parts abutting and forming a line of distinct subdivision between the parts.

8. A unitary die cast body of predetermined contour, said body comprising two parts, adja-' cent surfaces of said parts being united by interlocking elements, said elements being so shaped as to prevent relative movement of the parts longitudinally and transversely, thereby permanently uniting said parts against separation in any direction, adjacent surfaces of' the parts abutting and forming a line oi distinct subdivision between the parts, said parts being composed of thermoplastic material, and one 01' said parts being of a color contrasting to the color of the other part.

DAVIS MARINSKY. LOUIS H. MORIN. 

